6.23 Get-Even-Itis: The Most Expensive Disease in Trading
Get-even-itis is holding a broken loser to avoid crystallizing the loss, and the break-even you await recedes faster than price can chase it. Set the exit when calm and let the rule sell.
Author
ali askar
6.22 The Flawed Human Brain in Trading
Your brain runs savanna firmware on a market problem. Loss aversion, pattern-seeing, and herding kept your ancestors alive and lose money now. Knowing it doesn't help; route around it with a rule.
6.21 Why Simple Algorithms Beat Smart Humans
An expert with twenty years of feel loses to a rule on an index card: knowledge isn't the bottleneck, consistency is. The rule stops your mistakes and exploits everyone still making theirs.
6.20 Why Loss Control Is the Only Thing You Fully Control
You can't control whether a trade wins, only how much you lose when wrong. Recovery is brutally asymmetric, so size, stops, and correlation decide survival more than any signal.
6.2 Ranked Long/Short Systems Explained
Score the universe, sort it, buy the top slice and short the bottom in equal risk. The broad market cancels and you hold only the spread between winners and losers.
6.19 When to Switch Off a Trading System
Traders kill good systems in normal drawdowns and ride dead ones on hope. Write the kill rule before the pain, tie it to the drawdown envelope, and treat it as a dial, not a switch.
6.18 Smooth Equity Curves Are Built, Not Found
The single perfect equity curve doesn't exist. Smoothness is assembled from several rougher, uncorrelated systems whose drawdowns fall at different times, and even that fails in a crisis.
6.17 The Hidden Importance of Time in Market
Two systems with equal per-trade edge differ once you put them on a clock. Time in market sets return on capital, decides whether systems can offset each other, and charges hidden opportunity cost.
6.16 Profit Factor, Expectancy, and the Shape of Returns
Profit factor and expectancy are both blind to the shape of returns. Two systems with the same numbers can be robust or rest entirely on two lucky winners. Read the distribution, not just the summary.
6.15 Why Percent Profitable Is Overrated
An 80% win rate can lose money and a 36% win rate can print it. The win rate is half a number, useless without the payoff ratio, and optimizing for it quietly destroys real systems.
6.14 Expectancy: The Most Important Formula in Trading
Expectancy is the average win or loss per trade, the one number that says if a system makes money. A 36% win rate can print and a 70% win rate can bleed; only expectancy tells the truth.
6.13 When a Drawdown Means the System Is Broken
Every system draws down, so depth alone is no kill signal. Compare the live drawdown to the permutation envelope, set a breach line before the pain, and act when it's crossed instead of freezing.